专委会委员个人简介——袁家兴

袁家兴于2016年和2021年在上海交通大学获得物理学学士学位和博士学位。从2021年到2025年，他在日本东京大学担任博士后研究员。2025年1月，加入香港科技大学（广州），任助理教授、副研究员、博士生导师。他的研究方向集中于软物质系统中的结构、热力学和动力学，包括聚合物、聚电解质、纳米粒子、胶体悬浮液、水凝胶、蛋白质以及活性粒子等。截至目前，以第一作者或通讯作者身份在《Physical Review Letters》、《Nature Communications》、《ACS Nano》、《Macromolecules》和《ACS Macro Letters》等顶级学术期刊上发表学术论文。

在软物质物理研究方面，阐明弱酸-弱碱两性颗粒体系中电荷涨落与非均匀分布的协同作用机制，揭示其可以显著促进颗粒聚集[1]；揭示流体不可压缩性导致的“逆挤压流”效应，强调流体力学在带电胶体悬浮液自组装路径中的重要作用[2]；阐明聚电解质高分子链的塌缩动力学中静电作用、短程吸引、流体力学的竞争机制[3]；解决流体力学对蛋白质折叠速率的争议，阐明短程挤压流效应有助蛋白质选择快速折叠路径[4]；揭示高分子链应力慢松弛与相分离局域快形变的耦合机制导致网络状相分离结构的形成, 预测聚电解质凝聚体独特的相分离尺寸生长动力学规律，为理解生物凝聚体提供新视角[5]。

Biography of Professor:

Jiaxing Yuan received his Bachelor's degree and Ph.D. in Physics from Shanghai Jiao Tong University in 2016 and 2021, respectively. From 2021 to 2025, he worked as a postdoctoral researcher at the University of Tokyo, Japan. In January 2025, he joined The Hong Kong University of Science and Technology (Guangzhou) as an Assistant Professor and Ph.D. supervisor. His research focuses on the structure, thermodynamics, and dynamics of soft matter systems, including polymers, polyelectrolytes, nanoparticles, colloidal suspensions, hydrogels, proteins, and active particles. To date, he has published academic papers as the first author or corresponding author in top-tier journals such as Physical Review Letters, Nature Communications, ACS Nano, Macromolecules, and ACS Macro Letters.

In the field of soft matter physics, he has elucidated the mechanism of charge fluctuations and heterogeneous distribution in weak acid-weak base coated Janus particle systems, revealing their significant role in promoting particle aggregation [1]; discovered the "inverse squeezing flow" effect caused by fluid incompressibility, highlighting the importance of hydrodynamics in the self-assembly pathways of charged colloidal suspensions [2]; clarified the competitive mechanisms of electrostatic interactions, short-range attraction, and hydrodynamics in the collapse dynamics of polyelectrolyte polymer chains [3]; resolved the controversy over the role of hydrodynamics in protein folding rates, demonstrating that short-range squeezing flow effects facilitate the selection of fast folding pathways [4]; revealed that the coupling between slow stress relaxation in polymer chains and rapid local deformation during phase separation leads to the formation of network-like phase-separated structures, predicting unique growth dynamics of polyelectrolyte condensate phase separation sizes and providing new insights into biological condensates [5].

五篇代表作/Selected Publications

[1] Jiaxing Yuan, Kyohei Takae, and Hajime Tanaka. Impact of charge regulation on self-assembly of zwitterionic nanoparticles. Phys. Rev. Lett., 128(15):158001, 2022.

[2] Jiaxing Yuan, Kyohei Takae, and Hajime Tanaka. Impact of inverse squeezing flow on the self-assembly of oppositely charged colloidal particles under electric field. Phys. Rev. Lett., 129:248001, 2022.

[3] Jiaxing Yuan and Hajime Tanaka. Hydrodynamic effects on the collapse kinetics of flexible polyelectrolytes. Phys. Rev. Lett., 132:038101, 2024.

[4] Jiaxing Yuan and Hajime Tanaka. Impact of hydrodynamic interactions on the kinetic pathway of protein folding. Phys. Rev. Lett., 132:138402, 2024.

[5] Jiaxing Yuan and Hajime Tanaka. Network-forming phase separation of oppositely charged polyelectrolytes forming coacervates in a solvent. Nature Communications, 16(1):1517, 2025.